underwater mine

例句：

1. 1. Theship was damaged by a hidden underwatermine.
   这艘船被一个隐蔽的水下雷区损坏了。
2. 2. The military had toremove the underwater mines from theharbor.
   军方不得不从港口移除水下雷。
3. 3.The underwater mines were a majorconcern for the safety of the area.
   水下雷是该地区安全的主要担忧。